These are CP forged pistons designed specifically for the 1jz. No rebadged 2jz pistons here ;). The valve reliefs will accommodate 1mm oversized valves. Pins and rings are included. The ring set was selected to handle high boost and high rpm, nitrided steel top ring, tapered hook groove 2nd ring, and low tension oil rings. Price includes a complete set of 6 pistons with rings and pins and locks. .020" oversized is a stock item (.5mm over). These pistons require the block to be bored, then hone to fit Special order available for pistons coatings or .040" (1mm) oversized, 3 weeks lead time, call for pricing. Special order available for pistons coatings or .040" (1mm) oversized, 3 weeks lead time, call for pricing.